This is somewhat inconvenient if you want to work with it from a pure JavaScript perspective; I was hoping that it would have returned a GUID as a string instead. I was also concerned that this meant that I’d have to manage this manually as well on the server side in my actions, but it turns out that it works better than expected. The only caveat is that you have to use “_id” when creating queries; otherwise, you can use the GUID as-is and the Mongo APIs will convert it behind the scenes: